Question

I have 2 tables. For example “Fruits” and “Food” When I create a new entry for the Fruits table with the corresponding model, how do I save objects and attributes of this one to the other table called All?

Or easier: How to update another table when saving a new entry?

i need something like “update value where id=x”

Answer 1

You have to do something like this :

class Fruits < ActiveRecord::Base

    after_save :update_the_all_table

    private

        def update_the_all_table
            allobject = All.find(self.id)
            allobject.someattribute = self.someattribute # self is the fruit
            allobject.save
        end

end

Just so you know, you can also do the following if you don’t want to write the “private” !

class Fruits < ActiveRecord::Base

    after_save { |fruit|
        allobject = All.find(fruit.id)
        allobject.someattribute = fruit.someattribute
        allobject.save
    }

end